HTML tags ignored by Outlook
Outlook is using the Office / Word HTML rendering engine which does not support all HTML 4 tags / attributes. Here is a list of tags / attributes / parameters that are NOT supported by Outlook:
applet
bdo
button
form
iframe
input
isindex
menu
noframes
noscript
object
optgroup
option
param
script
select
accept-charset
accept
accesskey
archive
background (only when there is a URL)
checked
classid
code
codecore
codetype
compact
data
declare
defer
disabled
enctype
longdesc
marginheight
marginwidth
media ( screen | print | projection | braille | speech | all )
method
multiple
noresize
object
onblur
onchange
onclick
ondblclick
onfocus
onkeydown
onkeypress
onkeyup
onload
onmousedown
onmousemove
onmouseout
onmouseover
onmouseup
onreset
onselect
onsubmit
onunload
readonly
scrolling
selected
standby
tabindex
title
valuetype
textarea
td colspan=0
th colspan=0
frame frameborder=0
td rowspan=0
th rowspan=0
background-attachment
background-image
background-position
background-repeat
clear
display
float
list-style-image
list-style-position
text-transform
word-spacing
azimuth
background-attachment
background-image
background-position
background-repeat
border-spacing
bottom
caption-side
clear
clip
content
counter-increment
counter-reset
cue-before, cue-after, cue
cursor
display
elevation
empty-cells
float
font-size-adjust
font-stretch
left
line-break
list-style-image
list-style-position
marker-offset
max-height
max-width
min-height
min-width
orphans
outline
outline-color
outline-style
outline-width
overflow
overflow-x
overflow-y
pause-before, pause-after, pause
pitch
pitch-range
play-during
position
quotes
richness
right
speak
speak-header
speak-numeral
speak-punctuation
speech-rate
stress
table-layout
text-shadow
text-transform
top
unicode-bidi
visibility
voice-family
volume
windows
word-spacing
z-index
